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Provides the ability to add participants to help search and is responsible
for creating search indices.
<h2>Package Specification</h2>
<p>This package contains the API for adding content to the help search functionality
and is responsible for indexing all contents of the help system. To add content, a
plug-in must extend the <code>SearchParticipant</code> abstract class and point to it
using the <code>org.eclipse.help.search.searchParticipant</code> extension point.</p>
<p>The package also provides an abstract class that extends <code>LuceneSearchParticipant</code>
called <code>SearchParticipantXML</code> which adds functionality for parsing XML
documents.</p>

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